Have to admit the first time I drove my new (then) 2012 JKU in snow up a hill...the back end kept swaying out and it would not make it. Stupid me did not realize I actually had to pull the 4 x 4 handle to engage the 4 wheel drive. I was so used to full time 4wd on other vehicles I never gave it a thought..boy did I feel foolish. :facepalm:
Guilty of this as well. Driving our Subaru so often, I'm used to full time AWD. I did that one time in my TJ. Got in it in the snow and wondered why I was all over the road fishtailing. Turns out I forgot to put it in 4 High!